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5SHY4045L0003 址周期內(nèi)發(fā)生多次總線傳輸 使數(shù)據(jù)總線保持三態(tài)
5SHY4045L0003一個(gè)地址周期內(nèi)發(fā)生多次總線傳輸
使數(shù)據(jù)總線保持三態(tài)，并驅(qū)動(dòng)read引腳。當(dāng)數(shù)據(jù)就緒時(shí)，從卡將讀取數(shù)據(jù)驅(qū)動(dòng)到數(shù)據(jù)總線上，并將數(shù)據(jù)選通引腳驅(qū)動(dòng)到低電平。信令方案是異步的，這意味著傳輸不依賴于總線時(shí)鐘引腳的時(shí)序(與同步總線不同，如計(jì)算機(jī)與其外圍設(shè)備互聯(lián)標(biāo)準(zhǔn)).
塊傳輸協(xié)議允許在一個(gè)地址周期內(nèi)發(fā)生多次總線傳輸。在塊傳輸模式下，第一次傳輸包括一個(gè)地址周期，隨后的傳輸只需要數(shù)據(jù)周期。從機(jī)負(fù)責(zé)確保這些傳輸使用連續(xù)的地址。
總線主控可以通過兩種方式釋放總線。完成后釋放(RWD)，主機(jī)在完成一次傳輸后釋放總線，并且在每次后續(xù)傳輸前必須對(duì)總線進(jìn)行重新仲裁。對(duì)于請(qǐng)求釋放(ROR ),主機(jī)通過在兩次傳輸之間繼續(xù)置位BBSY來保留總線。ROR允許主設(shè)備保持對(duì)總線的控制，直到另一個(gè)希望對(duì)總線進(jìn)行仲裁的主設(shè)備斷言總線清除(BCLR)。因此，產(chǎn)生突發(fā)流量的主機(jī)可以優(yōu)化它的通過僅在每個(gè)突發(fā)的第一次傳輸時(shí)仲裁總線來提高性能。這種傳輸延遲的降低是以其他主機(jī)的傳輸延遲稍高為代價(jià)的。
地址修飾符用于將VME總線地址空間分成幾個(gè)不同的子空間。地址修飾符是底板上的一組6位寬的信號(hào)。地址修飾符指定有效地址位數(shù)、特權(quán)模式(允許處理器區(qū)分用戶級(jí)或系統(tǒng)級(jí)軟件的總線訪問)，以及傳輸是否為塊傳輸。
5SHY4045L0003 址周期內(nèi)發(fā)生多次總線傳輸 使數(shù)據(jù)總線保持三態(tài)
SHY4045L0003 Multiple bus transfers occur within an address cycle
Keeps the data bus in three states and drives the read pin. When the data is ready, the slave card will read the data drive onto the data bus and drive the data strobe pin to a low level. The signaling scheme is asynchronous, meaning that the transmission does not depend on the timing of the bus clock pin (unlike a synchronous bus, such as the computer interconnection standard with its peripherals).
The Block Transport protocol allows multiple bus transfers to occur within an address cycle. In block transfer mode, the first transfer includes one address cycle, and subsequent transfers only require data cycles. The slave is responsible for ensuring that these transmissions use continuous addresses.
The bus master can release the bus in two ways. Release after Completion (RWD), the host releases the bus after completing a transfer and must re-arbitrate the bus before each subsequent transfer. For request release (ROR), the host preserves the bus by continuing to set BBSY between transfers. ROR allows the master device to maintain control of the bus until another master device that wishes to arbitrate the bus asserts bus Cleanup (BCLR). Therefore, a host generating burst traffic can optimize its performance by arbitrating the bus only on the first transmission of each burst. This reduction in transmission latency comes at the expense of slightly higher transmission latency on other hosts.
Address modifiers are used to divide the VME bus address space into several different subspaces. An address modifier is a set of 6-bit-wide signals on the backplane. Address modifiers specify valid address bits, privileged mode (which allows the processor to distinguish bus access for user-level or system-level software), and whether the transfer is a block transfer.
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Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed
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